it tests whether teens are able to apply the reading, math and science skills to scenarios in the rile world. the tests say the united states is average when it comes too reading and sciential an sciencw average when it comes to math. they scored 481 in math and shanghai china scored of 18. 618 the sha shanghai students are ahead of u.s. students by two years. we have a loc a long way to go. the only way to improve is to invest is a in education. and these things coupled together are going to move us in the right direction. >> most participating countries improved their performage perfoe united states fell flat. it's confusing to 19-year-old jenny jung. >> i don't get how like the americans can score solo in a national test. >> the high school senior attended six years in the united states and most of her education occurred in korea. a country that ranked in the top six. many students in korea used special t tutors outside of school. >> i learned better here not in korea because they expect you to know everything if you don't have a tutor you don't have the idea but here because you do